<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>document</title>
		<script>
		 function showDoc(){
			 alert(window.document.title);
			 alert(window.document.lastModified);
			 alert(window.document.URL);
			 alert("从哪里来？"+window.document.referrer);
			 window.document.title=new Date().toLocaleTimeString();
		 }
		</script>
	</head>
	<body>
		<button onclick="showDoc()">修改document</button>
	</body>
</html>
